Meisam Nazari

• Ph.D.
• Postdoc at Aarhus University

This study challenges the century-old definition of the rhizosphere, proposing the existence of an aerial rhizosphere that extends beyond underground roots. This new paradigm introduces the mucilage microenvironment surrounding aerial roots as a distinct ecological niche, functioning independently of soil. This study reveals the dynamic parallels b...

Nitrogen (N) is a crucial nutrient for the growth and activity of rhizosphere microorganisms, particularly during drought conditions. Plant root-secreted mucilage contains N that could potentially nourish rhizosphere microbial communities. However, there remains a significant gap in understanding mucilage N content, its source, and its utilization...

Thinned steep forests are particularly vulnerable to soil physical degradation. Retaining deadwood logs from thinning operations on the forest floor can potentially mitigate soil physical degradation by modifying its physical properties through increased carbon content in steep regions. We aimed to investigate the effect of spruce deadwood logs fro...

Traffic activities in agricultural fields result in significant densification of the soil and distortion of the soil pore structure. The emission of greenhouse gases (N2O, CO2, and CH4) from agricultural fields contributes between 13 and 21% to global emissions. Compacted fields exhibit reduced gas flow by diffusion, and there is a potential to aff...

The use of heavy agricultural machinery has led to an increased risk of subsoil compaction within farming systems. Subsoil compaction has detrimental effects on the physical and hydrological functions of the soil, which can persist for several decades. However, our understanding of how subsoil compaction affects microbial indicators and the underly...

Purpose of Review Predicting, preventing, and minimizing machinery-induced soil compaction are of paramount importance in forest ecosystems. Understanding the soil’s susceptibility to compaction is crucial in achieving these goals. This meta-analysis assessed the relevance of climatic and soil conditions for the susceptibility of forest soils to wo...

Soil compaction caused by mechanized wood harvesting can have long-lasting negative impacts on forest soils and impair forest ecosystem functioning and productivity for decades. However, soil compaction in forest ecosystems cannot be resolved by tillage. Thus, it is of paramount importance to prevent or minimize soil compaction in forest ecosystems...

Soil compaction of agricultural systems due to the passage of heavy machinery persistently impairs the soil physical, hydrological, and biogeochemical functioning. Despite the existence of numerous studies on the influence of compaction on soil and plant characteristics, we lack studies translating such impacts into soil-related ecosystem services....

Conservation tillage practices, such as reduced tillage, are often considered beneficial regarding soil fertility and sustainability. However, a risk of developing a shallow compact hardpan is associated with these practices that can hinder optimal water and gas transport within the root zone and thus impact soil health and productivity. To explore...

Mechanization operations in agriculture have, for the last two decades, involved consistently higher wheel loads with an increased risk of soil compaction, particularly in the subsoil. Subsoil compaction is more persistent compared to the topsoil due to limited mitigation options. There is, however, a potential for the natural recovery of compacted...

Soil compaction caused by modern mechanized agriculture has severe impacts on soil functioning and negative consequences on crop production. In the subsoil, these effects are persistent and difficult to ameliorate. To further clarify the compaction effect on the subsoil, we imposed compaction on 21 st April 2022 on a moist Calcaric Chernozem (silty...

Deadwood is a key component of forest ecosystems, but there is limited information on how it influences forest soils. Moreover , studies on the effect of thinning-derived deadwood logs on forest soil properties are lacking. This study aimed to investigate the impact of thinning-derived deadwood logs on the soil chemical and microbial properties of...

Aims This study investigated the influence of climate and soil on the exudation rate and polysaccharide composition of aerial nodal root mucilage from drought-resistant and drought-susceptible maize varieties. Methods Two maize varieties were grown in two different soils (sandy-clay loam Acrisol and loam Luvisol) under simulated climatic conditio...

Mucilage is a gelatinous high-molecular-weight substance produced by almost all plants, serving numerous functions for plants and soil. To date, research has mainly focused on the hydraulic and physical functions of mucilage in the rhizosphere. Studies on the relevance of mucilage as a microbial habitat are scarce. Microbial research has largely fo...

Mucilage is a gelatinous high-molecular-weight substance produced by almost all plants, serving numerous functions for plant and soil. To date, research has mainly focused on hydraulic and physical functions of mucilage in the rhizosphere. Studies on the relevance of mucilage as a microbial habitat are scarce. Extracellular polymeric substances (EP...

This is the first large-scale study to assess the climate change impact on the grain yield of rainfed wheat for three provinces of contrasting climatic conditions (temperate, cold semi-arid, and hot arid) in Iran. Five integrative climate change scenarios including +0.5 • C temperature plus−5% precipitation, +1 • C plus−10%, +1.5 • C plus−15%, +2 •...

Producing daily actual evapotranspiration (ETa) maps with high spatial resolution has always been a challenge for remote sensing research. This study assessed the feasibility of producing daily ETa maps with a high spatial resolution (30 m) for the sugarcane farmlands of Amir Kabir Sugarcane Agro-industry (Khuzestan, Iran) using three different sce...

Soil compaction associated with mechanized wood harvesting can long-lastingly disturb forest soils, ecosystem function, and productivity. Sustainable forest management requires precise and deep knowledge of logging operation impacts on forest soils, which can be attained by meta-analysis studies covering representative forest datasets. We performed...

Although the Urmia Lake has undergone remarkable drought conditions within the past decades mainly due to climate change, drought studies covering the entire Urmia Lake Basin and all drought aspects are lacking. The present study investigated the spatial and temporal drought conditions in the Urmia Lake Basin for the past (1988-2017) and future (20...

This study aimed at analyzing the proportion of root and seed mucilage components and their functions in the rhizosphere. In total, polysaccharides (78.4%), proteins (7.3%), minerals (5.6%), and lipids (3.1%) constitute 94.3% of the mucilage composition. Mucilage polysaccharides are an energy source for microorganisms, absorb water, exchange cation...

Mucilage, a gelatinous substance comprising mostly polysaccharides, is exuded by maize nodal and underground root tips. Although mucilage provides several benefits for rhizosphere functions, studies on the variation in mucilage amounts and its polysaccharide composition between genotypes are still lacking. In this study, eight maize (Zea mays L.) g...

Wood harvesting is restricted to a system of permanent skid trails in order to minimize the soil disturbance and damage. Therefore, it is not the compaction of previously undisturbed forest soil, but the re-compaction of already existing skid trails that is of practical relevance when investigating machinery-induced wood harvest effects on soil pro...

It is very important to determine the irrigation water requirement (IR) of crops for optimal irrigation scheduling under the changing climate. This study aimed to investigate the impact of climate change on the future IR and yield of three strategic crops (winter wheat, barley, fodder maize) in the semi-arid Qazvin Plateau, Iran, for the periods 20...

This study investigated the effect of ultraviolet (UV-C) radiation on the germination percentage, germination rate, radicle length, and plumule length of maize and sugar beet seeds. The experiment was implemented in six replicates of 30 seeds per replicate and in sterilized petri dishes under laboratory conditions. Treatments included UV-C (254 nm)...

The climate of the Earth is changing. The Earth's temperature is projected to maintain its upward trend in the next few decades. Temperature and precipitation are two very important factors affecting crop yields, especially in arid and semi-arid regions. There is a need for future climate predictions to protect vulnerable sectors like agriculture i...

This study was conducted to investigate the effect of the biofertilizers Azotobacter chroococcum and Pseudomonas fluorescens with metribuzin in soil on growth and development of tomato (Solanum lycopersicum L.) in competition with weeds. An experimental design of randomized complete blocks with 13 treatments and 3 replicates was performed. Three le...

Common bean (Phaseolus vulgaris) is one of the most important legumes worldwide for human consumption. However, seeds oen have poor germination and the crop is unevenly established when cultivated in cool soils. We studied the effect of several ultrasonic wave treatments on common bean seed germination and speed, as well as on cotyledon cell area,...

Seeds are essential in rebuilding the production capacity of a crop, maintaining the germplasm, and improving species diversity. The ultrasound technology has been successfully used in many mass transfer processes in food, such as in drying, extraction, osmotic dehydration, desalting and hydration. However, during the recent years, ultrasonic waves...

To study the effect of sonication on the seed germination percentage and rate as well as the cell area of barley (Hordeum vulgare L.) a laboratorial experiment was performed as Completely Randomized Design (CRD) with 3 replications. The results indicated that the ultrasonic waves affect the seed germination, germination rate and cell area significa...

In order to investigate the effects of nitrogenous fertilizers (biological, chemical, integrative) on quantity and quality of forage-medicine in the additive intercropping of sorghum with fenugreek, an experiment was performed in two agronomic years 2010–2011 and 2011–2012 in the Research Farm of Agricultural Faculty of Tehran University located in...

Interaction between mycorrhizal fungi and herbicide application and their effects on plant growth are issues around which there is little information. Therefore, to determine the effect of arbuscular mycorrhizal (AM) fungus in alleviating the effects of herbicide stress on growth of maize and barley, two pot experiments were conducted in Shahrood U...

Dormancy breaking and germination stimulation of seeds are important for proliferation and early production of rangeland plants. Some important plant seeds are barely germinating in usual natural conditions. Thus, research on novel, safe and healthy methods of germination stimulation of such plants seeds is important and helpful in many different a...

In this study dormancy breaking of a hard-coated plant seed, Medicago scutellata, was investigated. The ultrasonic waves effect on the seed germination percentage, germination rate, radicle length and stalk length growth was assessed. Six treatments of waves exposure periods including 0, 1, 3, 5, 7, and 9 minutes were tested under laboratorial cond...